Locomotive stoker



A l-i110, 1928.

N. M. LOWER ET AL LOCOMOTIVE STOKER Filed ma 25. 1926 2 Sheets-Sheet l April 10, 1928.

1,665,748 N. M. LOWER ET AL LOCOMOTIIVE STOKER Filed May 25', 1926 2 Sheets-Sheet 2 J9 7Z6 J2 20 ii J6 I v Patented Apr. 10, 1928.

UNITED STATES PATENT OFFICE.

NATHAN M. LOWER AND EDXVIN ARCHER TURNER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNORS TO LOCOMOTIVE STOKER COMPANY, OF PITTSBURGH, PENNSYLVANIA,

A CORPORATION OF PENNSYLVANIA.

LOCOMOTIVE STOKER.

Application filed May 25,

The invention relates to stokers of the scatter feed type. in which the fuel is delivered centrally into the fire-box, below the firing door. and into a chamber inclosed by a water-cooled wall, through which cham her it is forced upwardly and from which it is scattered over the grate.

The invention has features in common with the stoker forming the subject of our companion application Serial No. 111,550, tiled Way 25, 1926. In the present instance the wall inclosing the fuel-receiving chamber is composed of tubes which communicate with the chambered baclrhead of the lire-box.

In the drawings- Fig. 1. is a detail vertical longitudinal section through the firebox and cab of a loco motive;

Fig. 2 is a plan view, partly in section, on the line 2-2 of Fig. 1;

Fig. 3 is a detail elevation of the inner face of the baclrhead of the locomotive;

Figs. at. 5 and 6 are views similar to Figs. 1, 2 and 3, showing modified forms of con struction.

The backhead of the fire-box is shown at 10, its grate is indicated at 11, and the deck or floor of the locomotive cab is shown at 12. lVithin the backhead 10, and below the usual hand-firing door opening 13, there is formed an aperture 1.4., through which fuel is delivered from a transfer conduit- 15, within which is housed a fuel-advancing element, such as the helical screw 16.

Inclosing the opening 14; is a wall formed of a series of U-shaped tubes 17, the ends of which are attached to the backhead and communicate with the chamber thereof. These tubes are of increasing length from the lower to the upper one, and together constitute a wall for a flaring fuel receiving chamber through which the fuel is forced by the advancing means, as the screw 16, and from which it is scattered over the surface of the grate by steam jets issuing from a nipple 18 attached to the backhead a little above the upper one of the tubes 17 This nozzle is supplied with steam by suitably arranged pipes, as 19.

The tubes 17 are inclined through their lengths, as indicated in Fig. 3, whereby 1926. Serial No. 111,551.

rapid circulation of water through them is insured, and are thus protected from the intense heat of the burning fuel. Preferably a portion of the grate 11 is omitted immediately below the set of tubes. the space being tilled by a dead plate 20, thereby preventing the active combustion of any fuel which may accumulate upon it.

In the form of construction illustrated in Figs. 4, 5 and 6, the wall for inclosing the fuel-receiving chamber takes the form of a pair of headers 21, 22, each having its ends attached to the backhead 10 and in communication with the chamber thereof. These headers are connected by a series of upstanding tubes 23, set as close together as good practice may dictate, and insuring free circulation of water through the entire wall; the water entering the header 22 and rising through the tubes 23 is returned to the backhead chamber through the header 21. As the water passes through this system of tubing its temperature is, of course. greatly increased, and a rapid circulation is thereby promoted. This circulation is further stimulated, and the accumulation of Steam in pockets is prevented, by inclining the lower header 22 upwardly and the upper header 21 downwardly.

If desired a lining for the fuehreceiving chamber may be provided, as indicated in Fig. 5, the lining 24 conforming in shape to and fitting against the U-shaped hollow wall and having at its upper margin a flange 25 which overlaps the upper header 21 for the tubular element 17. The presence of such a lining in either of the forms facilitates the upward movement of the fuel.

The invention is capable of embodiment in other forms, both as to the shape and arrangement of the tubular element-s constituting the wall of the fuel-receiving chamber as well as the location of such walls and their accessories.

lVe claim as our invention:

1. In a. locomotive fire-box, a hollow backhead having an aperture adjacent the grate, a fuel delivering conduit discharging through such aperture, a U-shaped wall formed of tubes having their ends in communication with the chamber of the backhead and inclosing the aperture, and means above the wall for projecting fuel thereover upon the grate.

2. In a locomotive firebox, a hollow backhead having an aperture adjacent the grate, a fuel delivering conduit discharging through such aperture, a U-shaped wall formed of tubes having their ends in communication with the chamber of the backhead and inclosing the aperture, such tubes being of diminishing length from above downwardly.

3. In combination, a firebox, a pair of U-shaped headers attached to the hollow backhead of the fire-box and having their chambers in communication with the chamber thereof, such headers being disposed one above the other, tubes connecting the two headers, means for delivering fuel to the chamber inclosed by the headers and tubes, means for supporting fuel within such chamher and means for discharging such fuel Over the grate.

4. In combination, a firebox, a pair of U-shapcd headers attached to the hollow backhead of the firebox and having their chambers in comunication with the chamber thereof, such headers being disposed one above the other, the lower header being of less length than the upper one, tubes connecting the two headers, means for delivering fuel to the chamber inclosed bythe headers and tubes, means for supporting fuel within such chamber and means for discharging such fuel over the grate.

In combination, a fire-box, a pair of U-shaped headers attached to the hollow backhead of the fire-box and having their chambers in communication with the chamber thereof, such headers being disposed one above the other, the lower header being of less length than the upper one and being inclined upwardly from its ends, tube-s connectlng the two headers, means for deliverlng fuel to the chamber inclosed by the headers and tubes, means for supporting fuel within such chamber and means for discharging such fuel over the grate.

6. In combination, a fire-box, a pair of U-shaped headers attached to the hollow backhead of the fire-box and having their chambers in communication with the chamber thereof, such headers being disposed one above the other, the lower header being of less length than the upper one, the upper header being inclined downwardly from its ends, tubes connecting the two headers, means for delivering fuel to thechamber inclosed by the headers and tubes, means for supporting fuel within such chamber and means .for discharging such fuel over the grate.

7. In combination, a fire-box having a hollow backhead, a U-shaped wall formed of tubes connected into the chamber of the backhead, means for delivering fuel into the space inclosed by the Wall, means for supporting fuel within such chamber and means for discharging fuel therefrom onto the grate of the firebox.

8. In combination, a fire-box having a hollow backhead, a U-shaped wall formed of tubes connected into the chamber of the backhead, a lining for the chamber inclosed by such wall, means for delivering fuel into such chamber, and means for discharging fuel therefrom onto the grate of the firebox.

9. In combination, a steam boiler and its fire-box, a U-shaped wall within the firebox and formed of tubes communicating with the water chamber of the boiler, such wall and a wall of the firebox inclosing a fuel-receiving chamber, means for delivering fuel to such chamber, means for supporting fuel within such chamber and means for dis charging fuel therefrom.

In testimony whereof we afiix our signatures.

NATHAN M. LOWER. E. ARCHER TURNER. 

